Furnace-arch.



1 ,285,69. Patented N0v. 19, 1918.

E. F. TFLLEY, 1B. FURNACE ARCH.

7 APPLICATION FILED FEB. 18. I918.

33313 (Blow 1e EDWIN F. TILLEY, .13., F PLAINFIl IELD, NEW JERSEY.

FURNACE-Anon.

Specification of Letters Patent. Patented Nov. 19, 1918.

Application filed February 18, 1918. Serial No. 217,745.

To all whom it may concern:

Be it known that I, EDWIN F. TILLEY, Jr., a citizen of the United Statesof- America, residing at Plainfield, New Jersey, have invented a new anduseful Furnace-Arch, of which the following is a specification.

My present invention relates to furnaces,

particularly to furnaces of the so-called heat treating type, wherein aperforated arch is provided for separating the combustion chamber fromthe heatlng chamber. These arches are usually subjected to the directheat of the burners, and this excessiveheat and the strains and stresseshave resulted in the more or less rapid deterioration and breaking downof such arches.

The objects of this invention are to improve the arch construction andto provide an arch which will be capable of withstanding the heat andstrain to which they are usually subjected.

The invention accordingly comprises an arch made of fire brick and theunits of which are interlockingly connected by means of interengagingribs and grooves on the meeting faces of the blocks or bricks composingthe arch, said blocks having formed therein suitable passages providingthe perforations in the arch. The arch is usually builtup with theinterfitting ribs and grooves at opposite sides of the crown of the archfacing in opposite directions, and means are usually provided at thecenter of the arch for keying the two sets of blocks together.

. The accompanying drawing illustrates the invention embodied in a heattreating furnace of approved construction, but it will be understoodthat the invention is applicable to furnaces of diii'erent types, andthat changes and modifications may be made without departure from thetrue spirit and scope of the invention.

In said drawings:

Figure 1 is a perspective view of a furnace. arch built into a furnaceof the overfired type.

Fig. 2 is .a. fragmentary plan view of a portion of the arch. y

Fig. 3 is a perspective view of one ofthe arch blocks. 7

Fi 4 is a similar view of a slightly modified orm of block.

Fig. 5 is a fragmentary plan view of an 5 arch made up ofthe blocksshown in F 4.

In the illustration 5 designates the rnace body provided with acombustion chamber 6 in the upper portion thereof and heating chamber 7in the lower portion thereof, said two chambers being defined by theperforated arch 8 which forms a partition separating the interior of thefurnace into these two chambers.

This arch is made up of individual blocks or tiles 9 of heat resistingmaterial ordinarily known as fire brick, said blocks being formed withpassages 10 which provide the perforations in the completed arch.

The arch blocks are tied together and the arch thus unified, in thepresent disclosure, by forming the blocks each with an integraloutstanding rib 11 on one side thereof, and a corresponding groove 12 inthe opposite side thereof, said ribs and grooves interlockingsubstantially on the median arc of the arch as indicated bythe line 13.

Preferably alsovthe arch is keyed at the center or crown by key blocks14 and the tiles at opposite sides of said crown are placed with theinterlocking grooves and ribs facing in opposite directions. In theparticular case disclosed. the blocks are placed with the ribs andgrooves at opposite sides of the crown facing in opposite directions,away from the crown and toward the ends of the arch. This provides anarch of practically unitary construction and further provides that incase of any settlement of the arch, the blocks being keyed together atopposite sides of the crown, maintain-the original strength andsolidarity of the arch. The reverse arrangement of the tiles at oppositesides of the crown also permits easy replacement of any individual tileswhich may become broken or injured, by the stantially as indicated inFigs, 4 and 5.

' The blocks are usually made with a taper toward'their lower ends, thedegree of taper depending upon the arc of the arch to be formed and maybe made of fire clay molded under pressure and then baked.

By my invention sagging or breaking down of the arch is prevented andthe arch is made much more durable and lasting and at the same timerepairs can readily be made when they are required.

I claim:

1. A perforated furnace arch composed "of fire brick having passagesforming openings through the arch, the bricks at one side of the medianline of the arch having interiitting ribs and grooves facing in onedirection' and the bricks at the opposite side of the median line havinginterfitting ribs and grooves facing in the opposite direction, and

keying means at the center of the' arch between said two series' ofinterlocked bricks.

2. A perforated furnace arch of fire brick having passages thereinproviding openings through the completed arch, said bricks havingintegral ribs and corresponding grooves in the opposite faces thereofinterlocking with the bricks adjoining in the arch.

3. A tile for a perforated furnace arch composed offire clay providedwith a passage forming a flue and having opposite sides tapered fromthe'top toward the bottom of the tile and formed with an out standingrib and a corresponding groove.

4. A perforated furnace arch of fire brick, the bricks of said archhaving passages in opposite sides thereof cooperating when the EDN r.TILLEY, JR.

